211 lines
6.6 KiB
Markdown
211 lines
6.6 KiB
Markdown
Fortify
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=======
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[](https://pkg.go.dev/git.ophivana.moe/security/fortify)
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[](https://goreportcard.com/report/git.ophivana.moe/security/fortify)
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Lets you run graphical applications as another user in a confined environment with a nice NixOS
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module to configure target users and provide launchers and desktop files for your privileged user.
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Why would you want this?
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- It protects the desktop environment from applications.
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- It protects applications from each other.
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- It provides UID isolation on top of the standard application sandbox.
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There are a few different things to set up for this to work:
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- A set of users, each for a group of applications that should be allowed access to each other
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- A tool to switch users, currently sudo and machinectl are supported.
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- If you are running NixOS, the module in this repository can take care of launchers and desktop files in the privileged
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user's environment, as well as packages and extra home-manager configuration for target users.
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If you have a flakes-enabled nix environment, you can try out the tool by running:
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```shell
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nix run git+https://git.ophivana.moe/security/fortify -- -h
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```
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## Module usage
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The NixOS module currently requires home-manager and impermanence to function correctly.
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To use the module, import it into your configuration with
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```nix
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{
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
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fortify = {
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url = "git+https://git.ophivana.moe/security/fortify";
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# Optional but recommended to limit the size of your system closure.
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inputs.nixpkgs.follows = "nixpkgs";
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};
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};
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outputs = { self, nixpkgs, fortify, ... }:
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{
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nixosConfigurations.fortify = nixpkgs.lib.nixosSystem {
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system = "x86_64-linux";
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modules = [
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fortify.nixosModules.fortify
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];
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};
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};
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}
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```
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This adds the `environment.fortify` option:
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```nix
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{ pkgs, ... }:
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{
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environment.fortify = {
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enable = true;
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user = "nixos";
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stateDir = "/var/lib/persist/module";
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target = {
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chronos = {
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launchers = {
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weechat.method = "sudo";
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claws-mail.capability.pulse = false;
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discord = {
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id = "dev.vencord.Vesktop";
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command = "vesktop --ozone-platform-hint=wayland";
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userns = true;
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useRealUid = true;
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dbus = {
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session =
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f:
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f {
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talk = [ "org.kde.StatusNotifierWatcher" ];
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own = [ ];
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call = { };
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broadcast = { };
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};
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system.filter = true;
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};
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share = pkgs.vesktop;
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};
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chromium = {
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id = "org.chromium.Chromium";
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userns = true;
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useRealUid = true;
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dbus = {
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system = {
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filter = true;
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talk = [
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"org.bluez"
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"org.freedesktop.Avahi"
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"org.freedesktop.UPower"
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];
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};
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session = f: f {
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talk = [
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"org.freedesktop.DBus"
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"org.freedesktop.FileManager1"
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"org.freedesktop.Notifications"
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"org.freedesktop.ScreenSaver"
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"org.freedesktop.secrets"
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"org.kde.kwalletd5"
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"org.kde.kwalletd6"
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];
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own = [
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"org.chromium.Chromium.*"
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"org.mpris.MediaPlayer2.org.chromium.Chromium.*"
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"org.mpris.MediaPlayer2.chromium.*"
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];
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call = { };
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broadcast = { };
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};
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};
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};
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};
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packages = with pkgs; [
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weechat
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claws-mail
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vesktop
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chromium
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];
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persistence.directories = [
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".config/weechat"
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".claws-mail"
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".config/vesktop"
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];
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extraConfig = {
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programs.looking-glass-client.enable = true;
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};
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};
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};
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};
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}
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```
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* `enable` determines whether the module should be enabled or not. Useful when sharing configurations between graphical
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and headless systems. Defaults to `false`.
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* `user` specifies the privileged user with access to fortified applications.
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* `stateDir` is the path to your persistent storage location. It is directly passed through to the impermanence module.
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* `target` is an attribute set of submodules, where the attribute name is the username of the unprivileged target user.
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The available options are:
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* `packages`, the list of packages to make available in the target user's environment.
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* `persistence`, user persistence attribute set passed to impermanence.
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* `extraConfig`, extra home-manager configuration for the target user.
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* `launchers`, attribute set where the attribute name is the name of the launcher.
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The available options are:
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* `id`, the freedesktop application ID, primarily used by dbus, null to disable.
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* `script`, application launch script.
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* `command`, the command to run as the target user. Defaults to launcher name. Has no effect when script is set.
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* `dbus.session`, D-Bus session proxy custom configuration.
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* `dbus.configSystem`, D-Bus system proxy custom configuration, null to disable.
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* `env`, attrset of environment variables to set for the initial process in the sandbox.
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* `nix`, whether to allow nix daemon connections from within the sandbox.
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* `userns`, whether to allow userns within the sandbox.
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* `useRealUid`, whether to map to the real UID within the sandbox.
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* `net`, whether to allow network access within the sandbox.
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* `gpu`, target process GPU and driver access, null to follow Wayland or X capability.
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* `dev`, whether to allow full device access within the sandbox.
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* `extraPaths`, a list of extra paths to make available inside the sandbox.
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* `capability.wayland`, whether to share the Wayland socket.
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* `capability.x11`, whether to share the X11 socket and allow connection.
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* `capability.dbus`, whether to proxy D-Bus.
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* `capability.pulse`, whether to share the PulseAudio socket and cookie.
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* `share`, package containing desktop/icon files. Defaults to launcher name.
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* `method`, the launch method for the sandboxed program, can be `"sudo"`, `"systemd"`, `"simple"`.
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